Fuse plug



FUSE PLUG Filed July 27, 1935 2 Sheets-Sheet l Inventor M10 M Caller A tlorney March 24, 1936. M CULBERT FUSE PLUG Filed July 27, 1955 2 Sheets-Sheet 2' Irwenlor Mia M 6 1011192";

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Patented Mar. 24, 1936 UNITED STATES.

PATENT OFFICE 2 Claims.

This invention appertains to new and useful improvements in fuse plugs.

The principal object of the invention is to provide a fuse plug constructed in such a manner as to permit quick insertion into a fuse socket.

Another important object of the invention is to provide a fuse plug involving construction whereby the fuse will be thrown from its socket upon the rupturing of its fusible elements.

These and various other important objects of the invention will become apparent to the reader of the following specification.

In the drawings:

Figure 1 represents a sectional view through a fuse socket showing the fuse installed therein.

Figure 2 represents a front elevational view of the fuse plug.

Figure 3 is a top plan view of the plug.

Figure 4 represents a side elevational view of the plug.

.Figure 5 represents an enlarged longitudinal sectional view of the plug.

Figure 6 represents a fragmentary perspective view of the detent for the fusible element.

Figure 7 represents a perspective view of the fusible element.

Referring to the drawings wherein like numerals designate like parts, it can be seen that the plug includes a cylindrical shaped body 5 of insulating material, the same having a fuse pocket 5 formed therein. Numeral 1 represents an arcuate closure plate. for closing substantially the pocket 6, leaving just suificient opening at the top and bottom thereof to permit the side portions of the semi-circular shaped spring 8 to protrude therethrough. Numeral 9 represents a head portion of the fuse which is corrugated suitably at its periphery, this head portion having a window Ill and being secured to the body 5 by a screw H. An elongated screw l2 not only extends through the head 9 but also through the closure plate I and into the inner end portion of the body 5 so that through the use of this screw l2 both the closure plate 1 and the head 9 are retained to the body 5.

In the pocket 6 the end portions of the spring 8 are secured by rivets l3 to the inner end portion of the body 5. Numeral ll represents a pin having a head for maintaining the spring l5 secured to the inner end of the body 5, this pin l4 extending inwardly to the pocket 6 where it is equipped with a substantially square shaped frame |5a having a slot IS in the end thereof for receiving the fusible element H. The intermediate portion of the spring 8 is also provided with a slot l8. It will be observed in Figure 7 that the fusible element I1 is provided with head portions lO-IS each longitudinal edge portion of which is provided with a notch 20 defining a T-portion 2!. These T-portions are disposed through the slots 16-48 and the fuse rotated so that the fuse will assume the position as shown in Figure 5 in which position, the fusible element will retain the spring 8 under tension in the contracted position shown in Figure 5 so that the struck-out bosses 22-22 project beyond the periphery of the body 5 and engage into the threads of the socket 23, as in the manner shown in Figure 1.

The frame l5a is connected to the contact 25 and this-contact 25 in the socket is connected by the conductor 26 to the binding post 21.

It can now be seen, that when the fuse l'l blows, the spring 8 will be released thus pulling in the boss members 2222 and freeing the plug from the screw socket 23 so that the spring 15 which has been under tension will throw'the plug out of the socket.

While the foregoing specification sets forth the invention in specific terms, it is to be under stood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus described the invention, what is claimed as new is:

1. A fuse plug comprising a di-electric body having a pocket therein, a current conductive semi-circular spring having its ends secured to The socket 23 has a. connection to the binding post 24.

the body in the pocket, a fusible element, a contact spring secured to the body, a slotted member in the pocket to which the contact is secured, said semi-circular spring being provided with a slottherein, said fusible element being provided with a key head at each end for engagement to the slotted member and the slotted portion of the semi-circular spring, said semi-circular spring when engaged by the fusible element is retained in a contracted position so that portions thereof protrude outwardly of the pocket at opposite sides of the body to engage with the threads of a fuse socket.

2. A fuse plug comprising a body of dielectric material, a compressible spring contact at one end of the body, a pair of thread engaging members mounted on the body. and normally projecting beyond the outside thereof, a fuse element, said fuse element being constructed and arranged to connect the compressible spring with the thread engaging members and to simultaneously retain said thread engaging members in thread engaging position, said thread engaging members being of spring material and adapted to contract to the body when the fuse element ruptures.

MILO M. CULBERT. 

